EP2748513B1

EP2748513B1 - Lighting device

Info

Publication number: EP2748513B1
Application number: EP12827351.3A
Authority: EP
Inventors: Byeong Guk Min; Jae O Kwak; In Soo Park; Seung Kyun Hong
Original assignee: LG Innotek Co Ltd
Current assignee: LG Innotek Co Ltd
Priority date: 2011-08-26
Filing date: 2012-08-24
Publication date: 2017-02-08
Anticipated expiration: 2032-08-24
Also published as: EP3179152A1; EP3179152B1; EP2748513A2; EP2748513A4; JP2014525652A; WO2013032181A3; CN103765078A; WO2013032181A2; JP6196218B2

Description

Technical Field

This embodiment relates to a lighting device.

Background Art

A light emitting diode (LED) is a semiconductor element for converting electric energy into light. As compared with existing light sources such as a fluorescent lamp and an incandescent electric lamp and so on, the LED has advantages of low power consumption, a semi-permanent span of life, a rapid response speed, safety and an environment-friendliness. For this reason, many researches are devoted to substitution of the existing light sources with the LED. The LED is now increasingly used as a light source for lighting devices, for example, various lamps used interiorly and exteriorly, a liquid crystal display device, an electric sign and a street lamp and the like.
Examples of light sources are provided in documents JP 2010 061 852 , US 2011/049749 , FR 2 938 047 , US 2011/133652 and US 2006/262545 .

Disclosure of Invention

Technical Problem

The objective of the present invention is to provide a lighting device including a light source and a circuitry which are separable from each other.
The objective of the present invention is to provide a lighting device of which the lifespan does not depend on the circuitry.
The objective of the present invention is to provide a lighting device of any damaged one out of the light source and circuitry can be freely replaced.
The objective of the present invention is to provide a lighting device of which the light source and circuitry can be independently produced and sold.
The objective of the present invention is to provide a lighting device capable both of remarkably reducing defects caused by the destruction of a tap when a bolt is fastened to conventional power supply unit (PSU) housings of MR, PAR and a general bulb product and of remarkably reducing defects caused by crack.
The objective of the present invention is to provide a lighting device capable of both reducing a manufacturing cost and an assembly lead time by removing parts.
The objective of the present invention is to provide a lighting device capable of maintaining security for the design structure of the PSU housing because the PSU housing is fastened within a heat sink by a hook and is difficult to analyze.
The objective of the present invention is to provide a lighting device which includes an inlet for injecting molding liquid to an inner case and causes the molding liquid to be injected into only heat generating parts, so that a manufacturing cost is reduced.
While in the past a rubber cover is inevitably added in order to prevent water from leaking at the time of injecting the molding liquid, the objective of the present invention is to provide a lighting device which cures the molding liquid by using the rubber cover as JIG and removes the rubber cover, so that a manufacturing cost is reduced by removing parts.

Solution to Problem

One embodiment is a lighting device. The lighting device includes: a light source including:a member which includes a first placement portion, a guide and a second placement portion;a light source module which is disposed in the first placement portion; and a first terminal which is disposed in the second placement portion and is electrically connected to the light source module; and a heat sink including:a first receiver in which the second placement portion of the member is disposed;a second receiver in which a circuitry is disposed; and a second terminal which is disposed corresponding to the first terminal of the light source, wherein the first placement portion and the second placement portion are separated by the guide, the first terminal includes a positive electrode and a negative electrode disposed on the second placement portion,the second terminal includes a positive electrode and a negative electrode disposed on one side of the heat sink,the first terminal mechanically contacts and is electrically connected to the the second terminal when the second placement portion is received in a the first receiver of the heat sink,the first terminal and the second terminal have a shape which is inserted and fitted like a battery or have a protruding shape which can be pushed inwardly.
The second placement portion of the member has a screw thread. The heat sink has a screw groove corresponding to the screw thread.
The member has a catching projection. The heat sink has a catching groove which is coupled to the catching projection.
The catching projection is disposed on the second placement portion of the member. The catching groove has an "L"-shape.
The second placement portion of the light source includes an insulating portion surrounding the first terminal. The insulating portion prevents electrical short-cut between the first terminal and the member.
The heat sink includes an insulating portion surrounding the second terminal. The insulating portion prevents electrical short-cut between the second terminal and the heat sink.
The light source module includes a substrate and a light emitting device disposed on the substrate. The member has a cavity in which the substrate is disposed.
The lighting device further includes a cover which is disposed over the light source module and is coupled to the member.
The member further includes a guide disposed between the cover and the heat sink.
The first terminal and the second terminal include a circular first electrode and a second electrode surrounding the first electrode, respectively.
A not claimed embodiment is a lighting device. The lighting device includes: a light source module; a heat sink in which the light source module is disposed and which has a receiver and an insertion recess disposed in the inner surface thereof defining the receiver; an inner case which is disposed in the receiver of the heat sink and has a hook coupled to the insertion recess; and a circuitry which is disposed within the inner case and supplies electric power to the light source module.
The hook is disposed on both sides of the outer surface of the inner case respectively.
The inner case has an opening. The hook extends toward the opening and projects in such a manner that the end of the hook is inclined.
The inner case includes: a cylindrical receiver; a connection portion disposed under the receiver in such a manner as to have a diameter less than that of the receiver; and a level-difference portion connecting the receiver with the connection portion.
The inner case has a guide projection disposed on the outer surface of the receiver in the longitudinal direction of the receiver. The heat sink has a guide groove disposed at a position corresponding to the position of the guide projection.
The inner case has a guide groove disposed on the outer surface of the receiver in the longitudinal direction of the receiver. The heat sink has a guide projection disposed at a position corresponding to the position of the guide groove.
Further another not claimed embodiment is a lighting device. The lighting device includes: a light source module; a heat sink in which the light source module is disposed and which has a receiver; an inner case which is disposed in the receiver of the heat sink and has at least one inlet for injecting molding liquid; and a circuitry which is disposed within the inner case and supplies electric power to the light source module.
The inner case includes: a cylindrical receiver; a connection portion disposed under the receiver in such a manner as to have a diameter less than that of the receiver; and an inclined portion connecting the receiver with the connection portion and having an inlet is disposed therein.
The inlet is sealed with silicone or resin material.
The heat sink has an insertion recess. The inner case has a hook coupled to the insertion recess.

Advantageous Effects of Invention

In a lighting device according to the embodiment, a light source and a circuitry of the lighting device can be separated from each other.
In the lighting device according to the embodiment, the lifespan of the lighting device does not depend on the circuitry.
In the lighting device according to the embodiment, any damaged one out of the light source and circuitry can be freely replaced.
In the lighting device according to the embodiment, the light source and circuitry can be independently produced and sold.
In the lighting device according to the embodiment, it is possible both to remarkably reduce defects caused by the destruction of a tap when a bolt is fastened to conventional PSU housings of MR, PAR and a general bulb product and to remarkably reduce defects caused by crack.
In the lighting device according to the embodiment, it is possible to reduce a manufacturing cost and an assembly lead time by removing parts.
In the lighting device according to the embodiment, it is possible to maintain security for the design structure of the PSU housing because the PSU housing is fastened within a heat sink by a hook and is difficult to analyze.
In the lighting device according to the embodiment, an inlet for injecting molding liquid into an inner case is formed and causes the molding liquid to be injected into only heat generating parts, so that a manufacturing cost is reduced.
While in the past a rubber cover is inevitably added in order to prevent water from leaking at the time of injecting the molding liquid, the lighting device according to the embodiment cures the molding liquid by using the rubber cover as JIG and removes the rubber cover, so that a manufacturing cost is reduced by removing parts.

Brief Description of Drawings

Fig. 1 is a perspective view of a lighting device according to a first embodiment;
Fig. 2 is an exploded perspective view of the lighting device shown in Fig. 1;
Fig. 3 is a perspective view showing that a light source and a circuitry of the lighting device shown in Fig. 1 are separated from each other;
Fig. 4 is a bottom perspective view of a heat sink shown in Fig. 2;
Fig. 5 is a view showing modified examples of a first terminal and a second terminal, each of which is shown in Figs. 2 and 3 respectively;
Fig. 6 is a perspective view showing a modified example of the lighting device shown in Fig. 2;
Fig. 7 is a view showing another modified example of the lighting device shown in Fig. 2;
Fig. 8 is a view showing further another modified example of the lighting device shown in Fig. 2;
Fig. 9 is an exploded perspective view of a not claimed lighting device.

Mode for the Invention

A thickness or size of each layer is magnified, omitted or schematically shown for the purpose of convenience and clearness of description. The size of each component does not necessarily mean its actual size.
In description of embodiments of the present invention, when it is mentioned that an element is formed "on" or "under" another element, it means that the mention includes a case where two elements are formed directly contacting with each other or are formed such that at least one separate element is interposed between the two elements. The "on" and "under" will be described to include the upward and downward directions based on one element.
A lighting device according to various embodiments will be described with reference to the accompanying drawings.

First embodiment

Fig. 1 is a perspective view of a lighting device according to a first embodiment. Fig. 2 is an exploded perspective view of the lighting device shown in Fig. 1. Fig. 3 is a perspective view showing that a light source and a circuitry of the lighting device shown in Fig. 1 are separated from each other. Fig. 4 is a bottom perspective view of a heat sink shown in Fig. 2.
Referring to Figs. 1 to 4, the lighting device according to the first embodiment may include a cover 100, a light source 200, a heat sink 300, a circuitry 400, an inner case 500 and a socket 600. Hereafter, the components will be described in detail respectively.
The cover 100 has a bulb shape or a hemispherical shape. The cover 100 has an empty space and a partial opening.
The cover 100 is coupled to the light source 200. Specifically, the cover 100 may be coupled to a member 250 of the light source 200. The cover 100 may be coupled to the member 250 by using an adhesive or various methods, for example, bolt-fastening, rotary coupling, hook coupling and the like. In the bolt-fastening method, the cover 100 and the member 250 are coupled to each other by using a bolt. In the rotary coupling method, the screw thread of the cover 100 is coupled to the screw groove of the member 250. That is, the cover 100 and the member 250 are coupled to each other by the rotation of the cover 100. In the hook coupling method, the cover 100 and the member 250 are coupled to each other by inserting and fixing the hook (for example, a protrusion, a projection and the like) of the cover 100 into the groove of the member 250.
The cover 100 is optically coupled to the light source 200. Specifically, the cover 100 may diffuse, scatter or excite light emitted from the light source 200. Here, the inner/ outer surface or the inside of the cover 100 may include a fluorescent material so as to excite the light emitted from the light source 200.
The inner surface of the cover 100 may be coated with an opalescent pigment. Here, the opalescent pigment may include a diffusing agent diffusing the light. The roughness of the inner surface of the cover 100 may be larger than that of the outer surface of the cover 100. This intends to sufficiently scatter and diffuse the light emitted from the light source 200.
The cover 100 may be formed of glass, plastic, polypropylene (PP), polyethylene (PE), polycarbonate (PC) and the like. Here, the polycarbonate (PC) has excellent light resistance, thermal resistance and rigidity.
The cover 100 may be formed of a transparent material causing the light source 200 to be visible to the outside or may be formed of an opaque material causing the light source 200 not to be visible to the outside.
The cover 100 may be formed by a blow molding process.
The light source 200 includes at least one light source module 210 and the member 250.
The light source module 210 is disposed on the member 250 in such a manner as to emit light to the inner surface of the cover 100. The member 250 may be coupled to the heat sink 300. The member 250 coupled to the heat sink 300 is able to electrically connect the light source module 210 with the circuitry 400. Hereafter, the light source module 210 and the circuitry 400 will be described in detail.
The light source module 210 includes a substrate 211 and at least one light emitting device 215. The light emitting device 215 is disposed on one side of the substrate 211. As shown in the drawing, the two light source modules 210 may be provided. Otherwise, one or more than three light source modules 210 may be provided.
The substrate 211 may be disposed on the member 250.
The substrate 211 may have a quadrangular plate shape. However, the substrate 211 may have various shapes without being limited to this. For example, the substrate 211 may have a circular plate shape or a polygonal plate shape. The substrate 211 may be formed by printing a circuit pattern on an insulator. For example, the substrate 211 may include a common printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB and the like. Also, the substrate 211 may include a chips on board (COB) allowing an unpackaged LED chip to be directly bonded to a printed circuit board. The substrate 211 may be formed of a material capable of efficiently reflecting light. The surface of the substrate 211 may have a color such as white, silver and the like capable of efficiently reflecting light.
The surface of the substrate 211 may be coated with a material capable of efficiently reflecting light. The surface of the substrate 211 may be coated with a color capable of efficiently reflecting light, for example, white, silver and the like.
The light emitting device 215 may be a light emitting diode chip emitting red, green and blue light or a light emitting diode chip emitting UV. Here, the light emitting diode chip may have a lateral type or vertical type and may emit blue, red, yellow or green light.
The light emitting device 215 may have a fluorescent material. The fluorescent material may include at least any one selected from a group consisting of a garnet material (YAG, TAG), a silicate material, a nitride material and an oxynitride material. Otherwise, the fluorescent material may include at least any one selected from a group consisting of a yellow fluorescent material, a green fluorescent material and a red fluorescent material.
The member 250 includes a first placement portion 251, a guide 253 and a second placement portion 255. Here, the first placement portion 251 may be the top surface of the member 250. The second placement portion 255 may be the bottom surface of the member 250. The first placement portion 251 and the second placement portion 255 are separated by the guide 253.
The light source module 210 is disposed in the first placement portion 251. Specifically, the substrate 211 of the light source module 210 is disposed in the first placement portion 251. The first placement portion 251 may have a cavity 251-1 into which the substrate 211 may be inserted. The depth of the cavity 251-1 may be the same as the thickness of the substrate 211. A plurality of the cavities 251-1 may be provided according to the number of the substrates 211.
As shown in Fig. 3, a first terminal 270 is disposed in the second placement portion 255. The first terminal 270 is a conductor through which electricity flows.
The first terminal 270 includes a positive (+) electrode and a negative (-) electrode. Here, the positive (+) electrode and the negative (-) electrode are disposed apart from each other. The positive (+) electrode is connected to the positive (+) electrode of a second terminal 330. The negative (-) electrode is connected to the negative (-) electrode of the second terminal 330.
The first terminal 270 is electrically connected to the light source module 210 disposed in the first placement portion 251. The first terminal 270 may be electrically connected to the light source module 210 by using a wire. That is, one end of a wire may be connected to the first terminal 270. The other end of the wire may be connected to the substrate 211 of the light source module 210.
The first terminal 270 may be electrically connected to the light source module 210 by the first terminal 270 itself. That is, one end of the first terminal 270 may be connected to the substrate 211 of the light source module 210. The other end of the first terminal 270 may be disposed in the second placement portion 255.
The first terminal 270 directly contacts with the second terminal 330 of the heat sink 300. Due to the direct contact between the first terminal 270 and the second terminal 330, the first terminal 270 and the second terminal 330 may be electrically connected to each other.
The guide 253 is disposed between the cover 100 and the heat sink 300. The upper portion of the guide 253 is coupled to the cover 100. The lower portion of the guide 253 is coupled to heat radiating fins 370 of the heat sink 300. The first placement portion 251 and the second placement portion 255 are separated by the guide 253.
The second placement portion 255 is received in a first receiver 310 of the heat sink 300. When the second placement portion 255 is received in the first receiver 310, the first terminal 270 mechanically contacts with the second terminal 330, and then the first terminal 270 and the second terminal 330 can be electrically connected to each other.
The member 250 may be formed of a material having thermal conductivity. This intends that the member 250 rapidly receives heat generated from the light source module 210 and protects the light source module 210 from the heat. The member 250 may be formed of, for example, Al, Ni, Cu, Mg, Ag, Sn and the like and an alloy including the metallic materials. The member 250 may be also formed of thermally conductive plastic. The thermally conductive plastic is lighter than a metallic material and has a unidirectional thermal conductivity.
The member 250 may include an insulating portion 290. When the member 250 is made of a metallic material through which electricity flows, since the first terminal 270 is also a conductor, electrical short-cut may occur between the member 250 and the first terminal 270. The insulating portion 290 prevents the electrical short-cut. The insulating portion 290 may be disposed in the second placement portion 255 of the member 250 in such a manner as to surround the first terminal 270.
The heat sink 300 receives the heat from the light source 200 and the circuitry 400 and radiates the heat. The heat sink 300 may be formed of Al, Ni, Cu, Mg, Ag, Sn and the like and an alloy including the metallic materials. The heat sink 300 may be also formed of thermally conductive plastic. The thermally conductive plastic is lighter than a metallic material and has a unidirectional thermal conductivity.
The heat sink 300 has the first receiver 310 and a second receiver 350.
The first receiver 310 may be formed by the heat radiating fins 370 and one side of the heat sink 300. Specifically, the first receiver 310 may be determined by one side 311 of the heat sink 300 and one side 371 of the heat radiating fin 370. Here, the one side 311 of the heat sink 300 and the one side 371 of the heat radiating fin 370 may be inclined with respect to each other or may be substantially perpendicular to each other.
The first receiver 310 receives the second placement portion 255 of the member 250. In this case, since the second placement portion 255 directly contacts with the one side 311 of the first receiver 310 and the one side 371 of the heat radiating fin 370, the heat from the member 250 may be directly transferred to the heat sink 300 and the heat radiating fins 370.
The second terminal 330 is disposed in the first receiver 310. The second terminal 330 is disposed on the one side 311 of the heat sink 300. The second terminal 330 is a conductor and directly contacts with the first terminal 270 of the member 250. Therefore, the second terminal 330 is electrically connected to the first terminal 270.
Like the first terminal 270, the second terminal 330 includes a positive (+) electrode and a negative (-) electrode. The positive (+) electrode and the negative (-) electrode are disposed apart from each other. The positive (+) electrode is connected to the positive (+) electrode of the first terminal 270. The negative (-) electrode is connected to the negative (-) electrode of the first terminal 270.
The second receiver 350 is disposed corresponding to the first receiver 310 of the heat sink 300. The first receiver 310 is disposed on the second receiver 350. Contrarily, the second receiver 350 is disposed under the first receiver 310.
The second receiver 350 may be a cavity formed in the other side of the heat sink 300. The second receiver 350 has a predetermined depth in the direction of the first receiver 310. The depth of the second receiver 350 may be greater than that of the first receiver 310. The depth of the second receiver 350 may be changed according to the size of the circuitry 400.
The second receiver 350 receives the circuitry 400 and the inner case 500. Specifically, the inner case 500 receives the circuitry 400, and then the second receiver 350 receives the inner case 500.
The heat sink 300 may have the heat radiating fins 370. The heat radiating fins 370 may extend from or may be connected to the outer surface of the heat sink 300. The heat radiating fins 370 increase the heat radiating area of the heat sink 300, thereby improving heat radiation efficiency.
The one side 371 of the heat radiating fin 370, together with the one side 311 of the heat sink 300 can determine the first receiver 310.
The guide 253 of the member 250 is disposed on the heat radiating fins 370. The heat radiating fins 370 are able to directly receive heat from the guide 253.
The heat sink 300 may include an insulating portion 390. When the heat sink 300 is made of a metallic material through which electricity flows, since the second terminal 330 is also a conductor, electrical short-cut may occur between the heat sink 300 and the second terminal 330. The insulating portion 390 prevents the electrical short-cut. The insulating portion 390 may be disposed on the one side 311 of the heat sink 300 in such a manner as to surround the second terminal 330.
The circuitry 400 receives external electric power, and then converts the received electric power in accordance with the light source module 210 of the light source 200. The circuitry 400 supplies the converted electric power to the light source 200.
The circuitry 400 is received in the heat sink 300. Specifically, the circuitry 400 is received in the inner case 500, and then, together with the inner case 500, is received in the second receiver 350 of the heat sink 300.
The circuitry 400 may include a circuit board 410 and a plurality of parts 430 mounted on the circuit board 410.
The circuit board 410 may have a quadrangular plate shape. However, the circuit board 410 may have various shapes without being limited to this. For example, the circuit board 410 may have an elliptical plate shape or a circular plate shape. The circuit board 410 may be formed by printing a circuit pattern on an insulator. The circuit board 410 may include a metal core PCB, a flexible PCB, a ceramic PCB and the like.
The circuit board 410 is electrically connected to the second terminal 330 of the heat sink 300. The circuit board 410 may be electrically connected to the second terminal 330 by using a wire. That is, one end of a wire may be connected to the second terminal 330. The other end of the wire may be connected to the circuit board 410.
The circuit board 410 may be electrically connected to the second terminal 330 by the second terminal 330 itself. That is, one end of the second terminal 330 may be directly connected to the circuit board 410. The other end of the second terminal 330 may be, as shown in Fig. 2, disposed on the one side 311 of the heat sink 300.
The plurality of parts 430 may include, for example, a Converter converting AC power supply supplied by an external power supply into DC power supply, a driving chip controlling the driving of the light source module 210, and an electrostatic discharge (ESD) protective device for protecting the light source module 210.
The inner case 500 receives the circuitry 400 thereinside. The inner case 500 may have a receiver 510 for receiving the circuitry 400. The receiver 510 may have a cylindrical shape. The shape of the receiver 510 may be changed according to the shape of the second receiver 350 of the heat sink 300.
The inner case 500 is received in the heat sink 300. The receiver 510 of the inner case 500 is received in the second receiver 350 of the heat sink 300.
The inner case 500 is coupled to the socket 600. The inner case 500 may include a connection portion 530 which is coupled to the socket 600. The connection portion 530 may have a screw thread corresponding to the screw groove of the socket 600. The diameter of the connection portion 530 may be less than that of the receiver 510.
The inner case 500 is a nonconductor. Therefore, the inner case 500 prevents electrical short-cut between the circuitry 400 and the heat sink 300. The inner case 500 may be made of a plastic or resin material.
The socket 600 is coupled to the inner case 500. Specifically, the socket 600 is coupled to the connection portion 530 of the inner case 500.
The socket 600 may have the same structure as that of a conventional incandescent bulb. The circuitry 400 is electrically connected to the socket 600. The circuitry 400 may be electrically connected to the socket 600 by using a wire. Therefore, when external electric power is applied to the socket 600, the external electric power may be transmitted to the circuitry 400.
The socket 600 may have a screw groove corresponding to the screw thread of the connection portion 530.
Fig. 5 is a view showing modified examples of the first terminal and the second terminal, each of which is shown in Figs. 2 and 3 respectively.
Terminals 270' and 330' shown in Fig. 5 are modified examples of the second terminal 330 shown in Fig. 2 and the first terminal 270 shown in Fig. 3.
Referring to Fig. 5, each of the first and the second terminals 270' and 330' may include a circular negative (-) electrode and a positive (+) electrode surrounding the negative (-) electrode. Contrarily, each of the first and the second terminals 270' and 330' may include a circular positive (+) electrode and a negative (-) electrode surrounding the positive (+) electrode.
Though not shown separately in the drawing, the second terminal 330 shown in Fig. 2 and the first terminal 270 shown in Fig. 3 have a shape which is inserted and fitted like a battery or have a protruding shape which can be pushed inwardly.
Fig. 6 is a perspective view showing a modified example of the lighting device shown in Fig. 2.
In description of the lighting device according to the modified example shown in Fig. 6, only differences between the lighting device shown in Fig. 6 and the lighting device shown in Figs. 1 to 4 will be described.
A light source 200' has a screw thread 255a'. Specifically, the screw thread 255a' may be disposed on a second placement portion 255' of a member 250'. More specifically, the screw thread 255a' may be disposed on the lateral surface of the second placement portion 255'.
The light source 200' includes the first terminal 270' shown in Fig. 5.
A heat sink 300' has a first receiver 310'. The first receiver 310' may be a cavity which is determined by the lateral surface 313' and bottom surface 311' of the heat sink 300'.
The heat sink 300' has a screw groove 313a'. The screw groove 313a' is coupled to the screw thread 255a' of the light source 200'. The screw groove 313a' may be disposed on the lateral surface 313' of the first receiver 310'.
The heat sink 300' includes the second terminal 330' shown in Fig. 5. The second terminal 330' may be disposed on the bottom surface 311' of the heat sink 300'.
In the lighting device shown in Fig. 6, the light source 200' and the heat sink 300' can be easily coupled to or separated from each other by rotating them through the use of the screw thread 255a' and the screw groove 313a'. Also, since the lighting device shown in Fig. 6 includes the first and the second terminals 270' and 330' shown in Fig. 5, the light source 200' and the heat sink 300' can be easily electrically connected to each other without distinguishing between the positive (+) electrode and the negative (-) electrode.
Fig. 7 is a view showing another modified example of the lighting device shown in Fig. 2.
In description of the lighting device according to the another modified example shown in Fig. 7, only differences between the lighting device shown in Fig. 7 and the lighting device shown in Figs. 1 to 4 will be described.
A light source 200" has a catching projection 253a". The catching projection 253a" may be disposed on a guide 253" of a member 250". Specifically, the catching projection 253a" may project from the guide 253" toward a heat sink 300".
The second placement portion 255" of the light source 200" includes the first terminal 270' shown in Fig. 5. However, the first terminal 270' may be the first terminal 270 shown in Fig. 3 without being limited to this.
The heat sink 300" has a tap 320". A first receiver 310" may be determined by the tap 320" and one side 311" of the heat sink 300".
The tap 320" has a catching groove 320a". The catching projection 253a" of the light source 200" is inserted into the catching groove 320a".
The number of the catching grooves 320a" may correspond to the number of the catching projections 253a".
The heat sink 300" includes the second terminal 330' shown in Fig. 5. However, the second terminal 330' may be the second terminal 330 shown in Fig. 2 without being limited to this.
In the lighting device shown in Fig. 7, the light source 200" and the heat sink 300" can be easily coupled to or separated from each other by using the catching projection 253a" and the catching groove 320a". Also, since the lighting device shown in Fig. 7 includes the first and the second terminals 270' and 330' shown in Fig. 5, the light source 200" and the heat sink 300" can be easily electrically connected to each other without distinguishing between the positive (+) electrode and the negative (-) electrode.
Fig. 8 is a view showing further another modified example of the lighting device shown in Fig. 2.
In description of the lighting device according to the further another modified example shown in Fig. 8, only differences between the lighting device shown in Fig. 8 and the lighting device shown in Fig. 7 will be described.
A light source 200"' has a catching projection 255a"'. The catching projection 255a"' may be disposed on a second placement portion 255"' of a member 250"'. Specifically, the catching projection 255a'" may project from the lateral surface of the second placement portion 255"'. Also, the catching projection 255a"' may project from the second placement portion 255"' perpendicularly to a direction in which the light source 200"' is coupled to a heat sink 300"'.
The light source 200"' includes the first terminal 270' shown in Fig. 5. However, the first terminal 270' may be the first terminal 270 shown in Fig. 3 without being limited to this.
The heat sink 300"' has a catching groove 320a"'. The catching projection 255a"' is inserted into the catching groove 320a"'. The catching groove 320a"' may be bent in the form of "L". As the catching projection 255a"' moves along the "L"-shaped catching groove 320a"', the light source 200"' may be coupled to the heat sink 300"'.
The number of the catching grooves 320a"' may correspond to the number of the catching projections 255a"'.
The heat sink 300"' includes the second terminal 330' shown in Fig. 5. However, the second terminal 330' may be the second terminal 330 shown in Fig. 2 without being limited to this.
In the lighting device shown in Fig. 8, the light source 200"' and the heat sink 300"' can be easily coupled to or separated from each other by using the catching projection 255a" and the catching groove 320a"'. Also, since the lighting device shown in Fig. 8 includes the first and the second terminals 270' and 330' shown in Fig. 5, the light source 200"' and the heat sink 300"' can be easily electrically connected to each other without distinguishing between the positive (+) electrode and the negative (-) electrode.

Claims

A lighting device comprising:
a light source (200) including:
a member (250) which includes a first placement portion (251), a guide (253) and a second placement portion (255);

a light source module (210) which is disposed in the first placement portion (251); and

a first terminal (270) which is disposed in the second placement portion (255) and is electrically connected to the light source module (210); and

a heat sink (300) including:
a first receiver (310) in which the second placement portion (255) of the member (250) is disposed;

a second receiver (350) in which a circuitry (400) is disposed; and

a second terminal (330) which is disposed corresponding to the first terminal (370) of the light source (200),
wherein
the first placement portion (251) and the second placement portion (255) are separated by the guide (253),
the first terminal (270) includes a positive (+) electrode and a negative (-) electrode disposed on the second placement portion (255),
the second terminal (330) includes a positive (+) electrode and a negative (-) electrode disposed on one side (311) of the heat sink (300),
the first terminal (270) mechanically contacts and is electrically connected to the the second terminal (330) when the second placement portion (255) is received in a the first receiver (310) of the heat sink (300),
characterized in that
the first terminal (270) and the second terminal (330) have a shape which is inserted and fitted like a battery or have a protruding shape which can be pushed inwardly.
The lighting device of claim 1, wherein the member (250") has a catching projection (253a"), wherein the heat sink (300") has a catching groove (320a") which is coupled to the catching projection (253a"), and wherein the catching projection (253a") is disposed on the second placement portion (255") of the member (250"), and wherein the catching groove (320a") has an L'-shape.
The lighting device of claim 1] or 2, wherein the second placement portion (255) of the light source (200) comprises an insulating portion (290) surrounding the first terminal (270), and wherein the insulating portion (290) prevents electrical short-cut between the first terminal (270) and the member (250).
The lighting device of claim 1 or 2, wherein the heat sink (300) comprises an insulating portion (390) surrounding the second terminal (330), and wherein the insulating portion (390) prevents electrical short-cut between the second terminal (330) and the heat sink (300).
The lighting device of any one of claims 1 to 4, wherein the light source module (210) comprises a substrate (211) and a light emitting device (215) disposed on the substrate (211), and wherein the member (250) has a cavity (251-1) in which the substrate (211) is disposed.
The lighting device of claim 5, wherein a depth of the cavity (251-1) is the same as a thickness of the substrate (211).
The lighting device of any one of claims 1 to 6, further comprising a cover (100) which is disposed over the light source module (210) and is coupled to the guide (253) of the member (250).
The lighting device of claim 7, wherein the guide (253) is disposed between the cover (100) and the heat sink (300).
The lighting device of any one of claims 1 to 8, wherein the first terminal (270') and the second terminal (330') comprise a circular first electrode and a second electrode surrounding the first electrode, respectively.
The lighting device of any one of claims 1 to 9, wherein the heat sink (300) comprises a plurality of heat radiating fins (370), and wherein the heat radiating fins (370) extend from or are connected to an outer surface of the heat sink (300).
The lighting device of claim 10, wherein each of the heat radiating fins (370) comprises one side (371), and wherein the plurality of the one sides (371) together with the one side (311) of the heat sink (300) determines the first receiver (310).
The lighting device of claim 10, wherein a lower portion of the guide (253) is coupled to heat radiating fins (370) of the heat sink (300).
The lighting device of claim 1, wherein the heat sink (300") comprises a tap (320"), and wherein the first receiver (310") is determined by the tap (320") and one side (311") of the heat sink (300").
The lighting device of claim 13, wherein the tap (320") has a catching groove (320a"), wherein the guide (253") comprises a catching projection (253a"), and wherein the catching projection (253a") is inserted into the catching groove (320a").